arch/s390/include/asm/page.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  *  S390 version
   4  *    Copyright IBM Corp. 1999, 2000
   5  *    Author(s): Hartmut Penner (hp@de.ibm.com)
   6  */
   7
   8 #ifndef _S390_PAGE_H
   9 #define _S390_PAGE_H
  10
  11 #include <linux/const.h>
  12 #include <asm/types.h>
  13
  14 #define _PAGE_SHIFT     12
  15 #define _PAGE_SIZE      (_AC(1, UL) << _PAGE_SHIFT)
  16 #define _PAGE_MASK      (~(_PAGE_SIZE - 1))
  17
  18 /* PAGE_SHIFT determines the page size */
  19 #define PAGE_SHIFT      _PAGE_SHIFT
  20 #define PAGE_SIZE       _PAGE_SIZE
  21 #define PAGE_MASK       _PAGE_MASK
  22 #define PAGE_DEFAULT_ACC        0
  23 #define PAGE_DEFAULT_KEY        (PAGE_DEFAULT_ACC << 4)
  24
  25 #define HPAGE_SHIFT     20
  26 #define HPAGE_SIZE      (1UL << HPAGE_SHIFT)
  27 #define HPAGE_MASK      (~(HPAGE_SIZE - 1))
  28 #define HUGETLB_PAGE_ORDER      (HPAGE_SHIFT - PAGE_SHIFT)
  29 #define HUGE_MAX_HSTATE         2
  30
  31 #define ARCH_HAS_SETCLEAR_HUGE_PTE
  32 #define ARCH_HAS_HUGE_PTE_TYPE
  33 #define ARCH_HAS_PREPARE_HUGEPAGE
  34 #define ARCH_HAS_HUGEPAGE_CLEAR_FLUSH
  35
  36 #include <asm/setup.h>
  37 #ifndef __ASSEMBLY__
  38
  39 void __storage_key_init_range(unsigned long start, unsigned long end);
  40
  41 static inline void storage_key_init_range(unsigned long start, unsigned long end)
  42 {
  43         if (PAGE_DEFAULT_KEY)
  44                 __storage_key_init_range(start, end);
  45 }
  46
  47 #define clear_page(page)        memset((page), 0, PAGE_SIZE)
  48
  49 /*
  50  * copy_page uses the mvcl instruction with 0xb0 padding byte in order to
  51  * bypass caches when copying a page. Especially when copying huge pages
  52  * this keeps L1 and L2 data caches alive.
  53  */
  54 static inline void copy_page(void *to, void *from)
  55 {
  56         register void *reg2 asm ("2") = to;
  57         register unsigned long reg3 asm ("3") = 0x1000;
  58         register void *reg4 asm ("4") = from;
  59         register unsigned long reg5 asm ("5") = 0xb0001000;
  60         asm volatile(
  61                 "       mvcl    2,4"
  62                 : "+d" (reg2), "+d" (reg3), "+d" (reg4), "+d" (reg5)
  63                 : : "memory", "cc");
  64 }
  65
  66 #define clear_user_page(page, vaddr, pg)        clear_page(page)
  67 #define copy_user_page(to, from, vaddr, pg)     copy_page(to, from)
  68
  69 #define __alloc_zeroed_user_highpage(movableflags, vma, vaddr) \
  70         alloc_page_vma(GFP_HIGHUSER | __GFP_ZERO | movableflags, vma, vaddr)
  71 #define __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE
  72
  73 /*
  74  * These are used to make use of C type-checking..
  75  */
  76
  77 typedef struct { unsigned long pgprot; } pgprot_t;
  78 typedef struct { unsigned long pgste; } pgste_t;
  79 typedef struct { unsigned long pte; } pte_t;
  80 typedef struct { unsigned long pmd; } pmd_t;
  81 typedef struct { unsigned long pud; } pud_t;
  82 typedef struct { unsigned long p4d; } p4d_t;
  83 typedef struct { unsigned long pgd; } pgd_t;
  84 typedef pte_t *pgtable_t;
  85
  86 #define pgprot_val(x)   ((x).pgprot)
  87 #define pgste_val(x)    ((x).pgste)
  88 #define pte_val(x)      ((x).pte)
  89 #define pmd_val(x)      ((x).pmd)
  90 #define pud_val(x)      ((x).pud)
  91 #define p4d_val(x)      ((x).p4d)
  92 #define pgd_val(x)      ((x).pgd)
  93
  94 #define __pgste(x)      ((pgste_t) { (x) } )
  95 #define __pte(x)        ((pte_t) { (x) } )
  96 #define __pmd(x)        ((pmd_t) { (x) } )
  97 #define __pud(x)        ((pud_t) { (x) } )
  98 #define __p4d(x)        ((p4d_t) { (x) } )
  99 #define __pgd(x)        ((pgd_t) { (x) } )
 100 #define __pgprot(x)     ((pgprot_t) { (x) } )
 101
 102 static inline void page_set_storage_key(unsigned long addr,
 103                                         unsigned char skey, int mapped)
 104 {
 105         if (!mapped)
 106                 asm volatile(".insn rrf,0xb22b0000,%0,%1,8,0"
 107                              : : "d" (skey), "a" (addr));
 108         else
 109                 asm volatile("sske %0,%1" : : "d" (skey), "a" (addr));
 110 }
 111
 112 static inline unsigned char page_get_storage_key(unsigned long addr)
 113 {
 114         unsigned char skey;
 115
 116         asm volatile("iske %0,%1" : "=d" (skey) : "a" (addr));
 117         return skey;
 118 }
 119
 120 static inline int page_reset_referenced(unsigned long addr)
 121 {
 122         int cc;
 123
 124         asm volatile(
 125                 "       rrbe    0,%1\n"
 126                 "       ipm     %0\n"
 127                 "       srl     %0,28\n"
 128                 : "=d" (cc) : "a" (addr) : "cc");
 129         return cc;
 130 }
 131
 132 /* Bits int the storage key */
 133 #define _PAGE_CHANGED           0x02    /* HW changed bit               */
 134 #define _PAGE_REFERENCED        0x04    /* HW referenced bit            */
 135 #define _PAGE_FP_BIT            0x08    /* HW fetch protection bit      */
 136 #define _PAGE_ACC_BITS          0xf0    /* HW access control bits       */
 137
 138 struct page;
 139 void arch_free_page(struct page *page, int order);
 140 void arch_alloc_page(struct page *page, int order);
 141 void arch_set_page_dat(struct page *page, int order);
 142 void arch_set_page_nodat(struct page *page, int order);
 143 int arch_test_page_nodat(struct page *page);
 144 void arch_set_page_states(int make_stable);
 145
 146 static inline int devmem_is_allowed(unsigned long pfn)
 147 {
 148         return 0;
 149 }
 150
 151 #define HAVE_ARCH_FREE_PAGE
 152 #define HAVE_ARCH_ALLOC_PAGE
 153
 154 #endif /* !__ASSEMBLY__ */
 155
 156 #define __PAGE_OFFSET           0x0UL
 157 #define PAGE_OFFSET             0x0UL
 158
 159 #define __pa(x)                 ((unsigned long)(x))
 160 #define __va(x)                 ((void *)(unsigned long)(x))
 161
 162 #define virt_to_pfn(kaddr)      (__pa(kaddr) >> PAGE_SHIFT)
 163 #define pfn_to_virt(pfn)        __va((pfn) << PAGE_SHIFT)
 164
 165 #define virt_to_page(kaddr)     pfn_to_page(virt_to_pfn(kaddr))
 166 #define page_to_virt(page)      pfn_to_virt(page_to_pfn(page))
 167
 168 #define phys_to_pfn(kaddr)      ((kaddr) >> PAGE_SHIFT)
 169 #define pfn_to_phys(pfn)        ((pfn) << PAGE_SHIFT)
 170
 171 #define phys_to_page(kaddr)     pfn_to_page(phys_to_pfn(kaddr))
 172 #define page_to_phys(page)      (page_to_pfn(page) << PAGE_SHIFT)
 173
 174 #define virt_addr_valid(kaddr)  pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
 175
 176 #define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | \
 177                                  VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 178
 179 #include <asm-generic/memory_model.h>
 180 #include <asm-generic/getorder.h>
 181
 182 #endif /* _S390_PAGE_H */